Jeff, they're very different wires regardless of the cost differential.
I haven't used yours but I have experimented with similar wire (silver-plated, stranded copper in PTFE jacket) and I didn't like it much. It was bright and a bit edgy in my system. Your favorite might not be, but on the surface of things it looks like the same kind of stuff and I am not keen to buy any more, even if it's inexpensive. That's my personal opinion and YMMV and all that, of course.
I've used other nice wire, some of it expensive and some very much not so (doorbell wire!) and I determined that I generally don't like silver-plated wire. Silver by itself - very high purity silver - is something different, though; I really like that in many cases.
Teflon has been hit or miss for me too, and I think it has something to do with how it's used as a dielectric. PTFE-sheathed cable I don't like, but solid core wire (silver or copper) in PTFE spaghetti tubing is nice - I think that's actually an air dielectric.
And speaking of wire dielectric (sheath), I think I've fully succumbed to the brainwashings of the ACA (Audiophile Church of the Arcane) -- natural is better. Give me cotton or silk, please! I can't begin to explain why, or use any fancier language to persuade you, but cotton and silk sound more... natural to me than plastics.
Tinned-copper wire was a real surprise to me. Tin seems so... pedestrian that I didn't want to like it. But darn if it ain't really really nice stuff! The Duelund wire is sheathed in church-approved black cotton and oil dielectricum -- it's sexy and it smells kinda funny too, which is cool.
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People like what complements their system . Your report does not surprise me.
Most amps I know of, particularly tube amps and SETs, use a cap input filter after the rectifier, and electrolytic caps on Rk bypasses. ( The " Fi X " 2A3 amplifier that just went for $2600 on eBay is a fine example. ) With a good wide band wire, that amp may "shout" at you. These are easily avoidable amp mis-designs - and are not the best way to go !!
People like Emilar EH-500 horns, which are " real smooth " to go well with their " shouting amp " designs, so as not to offend their ears.
I HATE amps that use a cap input filter, and electrolytic bypasses on Rks, and I will not compromise my wire choice, to match any amp I personally feel is mis designed. I also use all high quality modern film caps in my SETs' power supplies, never electrolytics .
I use a clone of a EH-500 horn, a SHOWCO 9000, on my VOTT A7-800s, and I am bored to death of its lack of dynamic projection for the 802D. I will be replacing it, mid year, I suspect. Its real smooth, precisely what would appeal to a gentleman " New England audiophile ", with a SET that shouts. Sorry, not for me.
I don't doubt your reporting, for one millisecond, and I even think I know why you hear what you hear. I have explained it herein.
So, the question is this :
(1) Is your amp using a cap input filter after the rectifier ( first thing it "sees" - which puts spikes on the B+ ) and
(2) are the Rks ( cathode resistors )
electrolytic bypassed when you were doing your wire evaluations ???
Dennis took " Best Room at Show " RMAF 2016 with the precise wire I suggested. But the amps he used, were designed optimally for audio.
Dowto1000